Re: [Vala] warning: copying delegates is discouraged

[Luca Bruno <lethalman88 gmail com>]

On Wed, Jun 08, 2011 at 03:20:58PM -0700, Jim Nelson wrote:
> Running valac from master, I'm seeing this warning pop up a lot:
>
> warning: copying delegates is discouraged
>
> Can someone explain the rationale for this?  (I'm guessing it has to do with
> references.)
>
> Are there any blessed workarounds (other than not copying delegates)?

The solution is tied to the specific case. The problem in general is:
Func f1; ...
Func f2 = f1;

Both delegates are owned, but when doing f2 = f1 you're "copying" the
delegate but it's not a real copy because the destroy notify is lost. So you
either want:
unowned Func f2 = f1;
or:
Func f2 = () => { f1 (); };

For properties either:
unowned Func f { get; set; }
or:
Func f { owned get; owned set; } <- this is bugged have to fix it,
workaround using private fields

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